linux ,apt不能获取的解决方法

问题描述： 

  sudo apt-get install sun-java6-jdk 
  出现如下信息： 
  Package sun-java6-jdk is not available, but is referred to by another 
  package. 
  This may mean that the package is missing, has been obsoleted, or 
  is only available from another source 
  E: Package sun-java6-jdk has no installation candidate 

问题解决： 
  1. sudo gedit 打开 /ect/apt/sources.list 
  2. 最后加入一行 
    “deb http://us.archive.ubuntu.com/ubuntu/ hardy multiverse” 保存关闭。 
  3. sudo apt-get update 
  4。sudo apt-get install sun-java6-jdk